Phase Transformation Hysteresis and Mechanical Properties of NiTiNb Shape Memory Alloys with Low Nb Contents
Author of the article: ZHANGZihan1, LI Bo1, LI Dou1, FENG Zhenyu1, ZHU Jiaxi1, CHEN Yixing1, YANGLuyan2, ZHONGHong1, LISh
Author's Workplace：1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China; 2. Beijing Key Laboratory of Microstructure and Property of Advanced Materials, College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China
Key Words：shape memory alloy; NiTiNb alloys; phase transformation hysteresis; microstructure; mechanical properties
Abstract：
NiTiNb 合金因其宽相变温度滞后特性，在管道连接件中具有重要的应用价值。 基于传统高铌含量(Nb≥
9%，原子分数)NiTiNb 合金性能，开发低铌含量(≤3%)NiTiNb合金，在降低成本的同时维持与高铌合金相当水平的超
弹性和形状记忆效应。探讨了低铌含量合金(Ni51
Ti49
)100-x
Nbx
(x=0,0.5,1.5, 3.0)微观组织、马氏体相变行为及力学性能。 结
果表明，随着合金中Nb含量增加到3.0%，马氏体相变开始温度和相变温度滞后均逐渐增加，伸长率增大，临界
应力和临界应变降低。 低铌合金(Ni51
Ti49
)97
Nb3 表现出 99.9%的应变恢复率，接近高铌合金水平，其相变温度滞后
达到38.7K，抗压强度高达1912MPa，超过了目前所报道的多数高铌NiTiNb合金，表现出较好的应用潜力。
